A Numerical Study of Parachute Inflation Based on a Mixed Method

Abstract

ἀ e C9 parachute was the research object in this work and was studied by using a fluid-structure interaction method and CFD method. An arbitrary Lagrangian-Eulerian method, a kind of fluid-structure interaction method, was used to simulate the inflation process. ἀ e dynamic relationship between canopy shape and flow field was obtained. ἀ e canopy shape in a stable phase was exported and was transformed into the porous media domain. ἀ en the flow around the canopy shape was simulated by the CFD method we used based on the k-ε turbulence model. ἀ e experiments verified the accuracy of structural change and the feasibility of the porous media model. ἀ e arbitrary Lagrangian-Eulerian method not only can obtain the dynamic results of structure and flow field but also can provide a more accurate bluff body for further CFD analysis. ἀ e CFD method based on porous media and the turbulence model can obtain more detailed and accurate flow field results, which can be used as a complement to fluid-structure interaction analysis. ἀi s mixed method can improve the accuracy of analysis and be useful for other permeable fabric research.

Study of Minimal Effective Reefing Ratio Based on an Empirical Formula and Fluid-Structure-Interaction Method

“…The asymmetry of the flow and structure field is eliminated using some simplifying assumptions described in the methods above. The influence of the reefing ratio on the inflation of the ringsail parachute has been researched by the arbitrary Lagrangian-Eulerian/ fluid-structure interaction (ALE/FSI) (Gao & Yu, 2014;Cheng, Yu, Rong, & Jia, 2012a). Numerical results including canopy shape, opening load, drag characteristics, and swing angle, were very consistent with wind tunnel tests.…”

Numerical Study of Parachute Dropping Based on Moving Meshes Method

“…The canopy large deformation effect mainly caused by fabric large rotation. Therefore the Saint Venant Kirchhoff constitutive equation was used to describe the fabric, and which was widely used in parachute dynamic simulation [7][8][9][11][12].…”

“…Kim and Peskin proposed the IB (Immersed Boundary) method to simulate the threedimensional parachute dropping under low Reynolds number [6]. Tutt, Cheng et al used ALE (Arbitrary Eulerian Lagrangian) method to study the parachute opening process [7][8][9]. Most of the above studies applied the fixed calculation domain, which are applicable to calculate the parachute opening in infinite mass situation such as opening in a wind tunnel.…”

Study on Transient Dynamics and Aerodynamic Characteristics of a New Type of High-Damping Four-Winged Rotating Parachute Inflation Process

“…Subsequently, they simulated the inflation process of a flat circular parachute in a finite mass scenario and conducted a series of indoor vertical parachute tests to verify the simulation results [24]. Cheng et al simulated the inflation process of a C-9 flat circle parachute with this method and then transformed the shape of the canopy into a CFD model that uses a porous medium model to simulate the permeability [25]. Gao et al used a multimaterial arbitrary Lagrange-Euler-coupled numerical method to simulate the inflation process of a slot parachute [26].…”